JP6724703B2 - Coke oven construction method - Google Patents

Description

The present invention relates to a coke oven construction method.

The chamber furnace coke oven has a two-layer structure in the upper and lower sides, and the heat storage chamber is arranged in the lower layer, and the carbonization chamber and the combustion chamber are arranged in the upper layer. A bellows portion (also called a corbel portion) is arranged between the upper layer and the lower layer. The longitudinal direction of the carbonization chamber is called the furnace length direction, and the direction in which the carbonization chambers and the combustion chambers are alternately arranged is called the furnace group length direction. The carbonization chamber has a length of about 16 m, a height of about 6 m, and a width of about 0.5 m in the length of the furnace group. The combustion chamber has a similar length and height of about 0.8 m. The chambers and the combustion chambers are arranged alternately in the lengthwise direction of the furnace group to form a furnace group. The heat storage chamber, the carbonization chamber, the combustion chamber, and the bellows are brick structures constructed by brick laying. During operation of the coke oven, the brick structures are respectively heated, and the furnace body is thermally expanded.

The brick structure has a heat storage chamber and a combustion chamber formed from below. Back stays for applying a furnace tightening force to the brick structure are arranged at both ends of the coke oven in the furnace length direction. Cross tie rods are provided at the upper and lower ends of the buckstay to apply tension to press the buckstay in the furnace tightening direction, and a furnace tightening force is formed by the furnace tightening springs provided at the connecting portion of the backstay and the cross tie rod. It

Protective plates are provided at both ends of the combustion chamber in the furnace length direction, furnace frames are provided at both ends of the carbonization chamber in the furnace length direction, and furnace lids of the carbonization chamber are connected to the furnace frame. Further, both the protective plate and the furnace frame contribute to the function of tightening the brick structure in the combustion chamber by the furnace tightening force from the back stay. That is, the furnace tightening force from the back stay is transmitted to the furnace frame, and the furnace tightening force transmitted to the furnace frame is transmitted to the protective plate, and the protective plate tightens the brick structure of the combustion chamber. There is. Further, a heat storage presser is provided between the back stay and the brick structure of the heat storage chamber, and the brick structure of the heat storage chamber is clamped by the furnace clamping force from the back stay via the heat storage presser. The protective plate is usually made of casting, and the heat storage presser is made of steel.

When building a brick structure for such a coke oven, usually, the back stay is first built first (Patent Document 1). The procedure is generally based on the following steps.
Step 1. The back stay 1 is built in a predetermined position (cold position) (FIG. 3(A)).
Step 2. The heat storage presser foot 2 is attached to the regular position of the built back stay 1 (FIG. 3(B)).
Step 3. A brick builder, a brick builder, builds a brick structure 5a starting from the heat storage chamber of the brick structure and extending to the bellows part (FIG. 3(C)).
Step 4. The protection plate 3 is attached to the back stay 1 at a regular position while being temporarily fixed so as not to move (FIG. 3D).
Step 5. A brick builder constructs a brick structure 5b that forms a carbonization chamber and a combustion chamber (FIG. 4(E)).
Step 6. The protective plate 3 attached to the back stay 1 in a temporarily fixed state is moved from the back stay 1 (FIG. 4(F)), and the furnace frame 4 is attached between the back stay 1 and the protective plate 3 (FIG. 4(G)). ). A furnace fastener 6 for pressing the furnace frame 4 against the protective plate 3 is attached (FIG. 4(H)). A furnace clamp 6 for tightening the heat storage retainer 2 is attached to the regular position of the back stay 1 (FIG. 4(H)).
Step 7. A cross tie rod (not shown in FIGS. 3 and 4) applies a furnace tightening force between the back stays 1 on both sides in the furnace length direction, and the heat storage presser foot 2 and the protective plate 3 are connected to the brick structure through the furnace tightener 6. To build a coke oven by pressing.

In building the brick structures 5a and 5b (brick stacking) in the above step 3 and step 5, a reference for positioning the brick structure is required. As a standard for brick-laying up to the bellows, the brick-laying reference line marked on the heat storage presser foot 2 and the back stay 1 is used. On the other hand, the brick-lining reference line for marking the protection plate 3 and the back stay 1 is used as the standard for the brick-laying in the combustion chamber. Therefore, prior to building the brick structure, the heat storage presser foot 2 and the protective plate 3 are accurately attached vertically to the height direction and at a predetermined position in the furnace length direction. Further, while the furnace is being built (brickwork), the heat storage presser foot 2 and the protective plate 3 must be provided at predetermined positions. After the furnace construction is completed, the furnace frame 4 is attached and then the furnace clamp 6 is installed as in steps 6 and 7, and the furnace tightening force is applied by a cross tie rod or the like not shown in FIGS. Then, the heat storage presser foot 2 and the protective plate 3 are pressed against the brick structure through the furnace clamp 6.

JP, 2005-78267, A

According to the conventional process described above, after the brick builder constructs the brick structure 5a in step 3, the protective plate 3 is attached to the backstay 1 in step 4, and the furnace builder again constructs the brick structure 5b in step 5. To build. That is, during the period between the steps 3 and 5, during the period of installing the hardware such as the protective plate 3 of the step 4 that needs to be installed before the brick building of the furnace, the furnace builder cannot wait and cannot stand by. I don't get. The step 4 relating to the installation of the protective plate 3 takes about one week depending on the number of kilns. If the furnace builder is kept on standby for more than one week, the work period is extended (work efficiency is low) and the furnace builder is restrained during that time, which results in a heavy daily allowance and a high cost. Further, when the protection plate 3 and the like are attached after the back stay 1 is built, an aerial work vehicle and a work scaffold are required. Therefore, the cost of heavy equipment and scaffolding is high, and the work efficiency is poor.

In view of the above circumstances, the present invention aims to provide a coke oven construction method capable of shortening the coke oven construction period and suppressing the coke oven construction cost while maintaining the construction accuracy. To do.

The gist of the present invention for solving the above problems is as follows.
(1) With the backstay laid down, the furnace clamp and the protective plate are installed in advance on the backstay,
Stand the back stay with the furnace clamp and protection plate in place,
Brick construction of brick structures,
A method for constructing a coke oven, comprising moving a protective plate installed on a back stay to a predetermined position and installing a furnace frame after the brick building of the brick structure is completed.
(2) The method for constructing a coke oven as set forth in (1), wherein the heat storage presser is further installed or fitted in the back stay in advance in a state where the back stay is laid down.
(3) When installing the furnace frame, the furnace frame is lifted from the upper side and inserted and installed, and a temporary roof structure that secures a space to be a hanging margin above the backstay at the time of insertion ( The method for constructing a coke oven according to 1) or 2).
(4) When installing the furnace frame, it is characterized in that it is inserted between the back stay and the furnace clasp and the protective plate while adjusting the position of the crane so that the furnace frame vertically descends from the back stay ( The method for constructing a coke oven according to any one of 1) to 3).

The coke oven construction period can be shortened and the construction cost can be suppressed. In addition, the accuracy of furnace construction work can be maintained.

It is a figure explaining the first half procedure of the construction method of the coke oven of the present invention. It is a figure explaining the latter half procedure of the construction method of the coke oven of the present invention. It is a figure explaining the first half procedure of the construction method of the conventional coke oven. It is a figure explaining the latter half procedure of the construction method of the conventional coke oven. It is a figure explaining the state which installed the protective plate and the furnace clamp in advance in the back stay. It is a figure explaining that it is difficult to install a furnace frame from the front of a backstay in the present invention. It is a figure explaining conventionally that a furnace frame can be installed from the front of a backstay. It is the figure which showed that the furnace frame was lifted from the upper part and the plug-in installation was performed by the overhead crane provided in the temporary shed.

The present invention shortens the construction period by preliminarily installing the furnace clasp 6 and the protective plate 3 in the back stay 1 and omitting the step of installing the furnace clasp 6 and the protective plate 3 at the construction site. ..
The steps will be described in detail with reference to (A) to (E) of FIGS.

Step (1).
With the buckstay 1 lying down, the furnace fastener 6 and the protective plate 3 are installed in advance on the backstay 1 (FIG. 1A). Specific examples of the furnace clamp 6 include a furnace clamp spring 6a and a furnace frame retainer 6b (springs, spring boxes, beams, bolts and nuts) shown in FIG. 7B. It is a general term for hardware that can be installed in a state in which 1 is laid down. If the furnace clamp 6 and the protective plate 3 are installed on the back stay 1 in a lying state, a work vehicle for a high place is unnecessary, and it is better than installing the furnace clamp 6 and the protective plate 3 on the vertically installed back stay 1. Since it is easy, the working time can be shortened. In addition, since the plurality of furnace fasteners 6 and the protection plate 3 installed in each part of the backstay 1 in the up-down direction can be installed at the same time by working while lying down, work efficiency is good. If a plurality of furnace fasteners 6 and the protective plate 3 are to be attached with the backstay 1 in an upright state as in the conventional case, the backstay 1 can be operated at the same time in the vertical direction. Simultaneous vertical work should be avoided because it is possible that the items handled by the above will fall to the work site below.

Further, as will be described later, the protection plate 3 installed in advance is removed from the backstay 1 after the bricks are piled up (FIG. 2D), but the installation in the present invention means the backstay 1 of the protection plate 3. It is necessary to fix it. This is because if the protective plate 3 attached to the backstay 1 is not sufficiently fixed in the lying state, the protective plate 3 may fall when the backstay 1 is built.
Conventionally, when the protective plate 3 is attached after the backstay 1 is built, the bracket is temporarily welded to the backstay 1 and hook bolts provided on the bracket are hooked on the protective plate 3 to be attached to the backstay 1 side. It was In this method, for example, a screw hole is provided on the surface of the backstay 1 that faces the protective plate 3, and a push bolt is screwed into the screw hole to adjust the protrusion amount of the push bolt on the protective plate 3 installation side. The mounting position of No. 3 is adjusted. However, in this method, since the hook bolt is easily removed from the protective plate 3, the protective plate 3 is likely to fall. In addition, the protection plate 3 is only attached to the holes machined in the protection plate 3, and there is a possibility that the position of the protection plate 3 may be displaced when touched by an operator or the like. Since a reference line is marked on the back stay 1 and the protective plate 3 in the furnace construction work, the positional deviation of the protective plate 3 causes deterioration of the furnace construction accuracy. Therefore, it is necessary to take measures to prevent displacement even if the installer touches it.
5(A) to 5(C) show the installation of the furnace fastener 6 and the protective plate 3 on the back stay 1 in the state where the back stay 1 is laid down according to the present invention. FIG. 5(A) shows a state in which the furnace fastener 6 and the protective plate 3 are installed in advance on the back stay 1 on the side opposite to the side on which the protective plate 3 is installed (when the back stay 1 is erected, it is located outside the furnace) It is the figure seen from this direction, omitting the description of the flange of the back stay 1. FIG. 5B is a partial cross-sectional view taken along the line BB of FIG. 5A, showing a fixed state of the back stay 1 and the protective plate 3. 5(C) is a partial cross-sectional view taken along the line CC of FIG. 5(A), and is an upper cross-sectional view showing the installed state of the back stay 1 and the furnace clasp 6. In FIG. 5(B), the furnace clamp 6 is omitted in order to facilitate understanding of the fixed state of the backstay 1 and the protective plate 3, and in FIG. 5(C) the backstay 1 and the furnace clamp 6 are omitted. The fixed angle 7 is omitted to make it easier to understand the installation state.
One specific method of fixing the protective plate 3 in the present invention is to fix the backstay 1 and the protective plate 3 via a fixing angle 7 as shown in FIG. 5(B). In FIG. 5(B), the fixed angle 7 is fixed to the backstay 1 by the fixing bolt 8, and the protective plate 3 uses the bolt hole for installing the furnace frame 4 provided in the protective plate 3, It is mounted by being screwed to the fixed angle 7 with the mounting bolt 9 passed through. Alternatively, they may be fixed by spot welding. If the main welding is used, it takes a lot of time to remove it, and the protective plate 3 is deformed during the removal. By using spot welding, it is easy to release the temporary fixing after the furnace construction work. On the other hand, the furnace fastener 6 is attached as shown in FIG.
In addition, in FIG. 1(A), the protection plate 3 and the furnace clamp 6 as well as the heat storage presser 2 are installed with the backstay 1 lying down. Before the start, the heat storage presser foot 2 can be installed even after the back stay 1 is built.

Step (2).
The back stay 1 to which the furnace fastener 6 and the protective plate 3 are attached in advance is set up at a predetermined position (FIG. 1(B)). Since at least the furnace clasp 6 and the protective plate 3 have already been installed in the back stay 1 by the step (1), it is not necessary to perform the step of installing them, and the furnace for the next step (brick laying) can be promptly installed. The marking of the reference line for can be started.

Step (3).
A brick-laying reference line is marked on the back stay 1 and the protective plate 3, and the brick structure 5a up to the bellows and the brick structure 5b forming the carbonization chamber and the combustion chamber are continuously bricked based on the reference line. (FIG. 1(C)). Since the brick structure 5a and the brick structure 5b are continuously piled up, it is not necessary to wait for the furnace builder to wait, and it is possible to reduce costs and shorten the construction period.

Although the above is an essential step as a feature of the present invention, in step (1), it is more preferable to install the heat storage presser foot 2 together with the furnace fastener 6 and the protective plate 3 in the back stay 1 that has been laid down in advance (Fig. 1 (A)). By letting the back stay 1 lie down, in addition to the furnace clamp 6 and the protective plate 3, the heat storage retainer 2 can be installed simultaneously. The heat storage presser foot 2 is preferably installed fixedly on the backstay 1 by spot welding similarly to the case where the protective plate 3 is installed. Since the protective plate 3 has a screw hole to be attached to the furnace frame 4, the screw hole can be used for installation on the back stay 1, but the heat storage presser foot 2 is not to be attached to the furnace frame 4 and has no screw hole. It can be fixed by spot welding.
On the other hand, since the heat storage presser foot 2 is composed of a flat plate and a bar protruding from the flat plate (the bar is not shown in the figure), even if the heat storage presser foot 2 is not fixed by being installed on the backstay 1. It is also possible to mount it on the backstay 1 by fitting the part into the backstay 1. In that case, the heat storage presser foot 2 fitted in the backstay 1 needs to be fixed to the backstay 1 before the start of the furnace construction, but the fixing may be performed after the backstay 1 is built, The stay 1 may be fixed while lying down.

Note that the heat storage presser foot 2 is attached to the back stay 1 before starting the furnace construction of the brick structure 5a, whether it is installed on the lying back stay 1 or attached to the built back stay 1. Then, the heat storage presser metal 2 is marked with a reference line necessary for the construction of the brick structure 5a, and then the construction of the brick structure 5a is started. When all the furnaces up to the brick structure 5a or the brick structure 5b are completed, the heat storage presser foot 2 is moved to a predetermined position, and the reference line marking the heat storage presser foot 2 becomes unnecessary. The heat storage presser foot 2 is brought into close contact with the original position where 5a can be pressed.

Step (4).
After the brick building of the brick structure 5b is completed, the protection plate 3 installed on the back stay 1 is removed (FIG. 2D), the protection plate 3 is moved to a predetermined position, and the furnace frame 4 is installed (FIG. 2). (E)). When the brick stacking is completed, the reference line marked on the protective plate 3 is no longer necessary, so the protective plate 3 is installed in close contact with the original position where the brick structure 5b can be protected. Then, the furnace frame 4 is installed outside the protective plate 3 as usual.

In the present invention, when the backstay 1 is in the built state, the furnace fastening spring 6a and the furnace frame retainer 6b and other furnace fastening metal 6 are already installed in the backstay 1 (FIG. 6). Therefore, when the furnace frame 4 is installed in the step (4), if the furnace frame 4 is installed between the protective plate 3 and the furnace frame retainer 6b from the front of the furnace 32 in the furnace length direction 32, the furnace frame retainer is pressed. There is a case where it cannot be installed due to interference with the furnace clamp 6 such as the metal 6b. Conventionally, as shown in FIG. 7, the installation of the furnace fastener 6 was carried out after the installation of the furnace frame 4, so such a problem was hard to occur. In the present invention, when such a problem occurs, as shown in FIG. 8, the furnace frame 4 is suspended from the overhead crane 10 of the temporary shed 11 which is usually provided on the backstay 1 during the construction of the coke oven. Then, it becomes necessary to insert it into a predetermined position from above.

When the furnace frame 4 is suspended from the temporary shed 11 and installed by inserting it at a predetermined position from above, a space that is sufficiently longer than the length of the furnace frame 4 is provided above the backstay 1 when the furnace frame 4 is installed. Therefore, it is necessary to increase the height of the temporary shed 11 and install a suspending device such as the overhead crane 10 at a high position of the temporary shed 11. Specifically, in the temporary shed 11, the space between the lower end of the furnace frame 4 and the uppermost part of the protection plate 3 attached to the backstay 1 is about 1 m when the crane reaches the maximum lifting height. It must be a structure with the overhead crane 10 in position.

Further, as described above, when the furnace frame 4 is inserted from the upper portion of the back stay 1, the furnace frame is inserted from the upper portion of the back stay 1 using the overhead crane 10, but the front, rear, left, and right gaps are narrow, and are only about 20 mm. It is necessary to lower the frame 4 vertically. Therefore, when installing the furnace frame 4 on the back stay 1, it is preferable to install it while adjusting the position of the furnace frame 4 by the overhead crane 10 so as to vertically descend.

After the step (4), as usual, a furnace staying force is applied to the backstay 1 with a cross tie rod or the like not shown in FIGS. Press 3 against the brick structure to build a coke oven.

As in the present invention, a process of previously installing the furnace fastener 6 for the protection plate 3 and the protection plate 3 on the lying backstay 1 is adopted, and a process of newly attaching the protection plate 3 to the built backstay 1 is performed. Only by omitting it, the construction period could be shortened by 10 days. In addition to this, when the furnace clamp 6 for the heat storage presser foot 2 and the heat storage presser foot 2 were preliminarily installed in the lying backstay 1, it was possible to further shorten the construction period by about 5 days. In addition, it was possible to maintain the accuracy of furnace construction at a good level.

INDUSTRIAL APPLICABILITY As described above, since the present invention can reduce the restraint time of the furnace builder while maintaining the construction accuracy, the labor cost can be saved, and the protective plate and the furnace clasp can be simultaneously installed on the back stay. It has great industrial utility that the construction period of coke oven can be shortened and the cost of coke oven construction can be suppressed.

DESCRIPTION OF SYMBOLS 1... Back stay 2... Heat storage metal fixture 3... Protective plate 4... Furnace frame 5a, 5b... Brick structure 6... Furnace clamp 6a... Furnace clamp spring 6b... Furnace frame retainer 7... Fixed angle 8... Fixing bolt 9... Mounting bolt 10... Overhead crane 11... Temporary roof 31... Reactor group longitudinal direction 32... Furnace longitudinal direction

Claims (4)

With the back stay laid down, the furnace fasteners and protective plate are installed in advance on the back stay,
Stand the back stay with the furnace clamp and protection plate in place,
Brick construction of brick structures,
A method for constructing a coke oven, comprising moving a protective plate installed on a back stay to a predetermined position and installing a furnace frame after the brick building of the brick structure is completed. The method for constructing a coke oven according to claim 1, wherein a heat storage presser is further installed or fitted in the backstay in advance in a state where the backstay is laid down. When installing the furnace frame, the furnace frame is lifted from above and installed, and a temporary roof structure is provided in which a space serving as a hanging margin above the backstay is secured when the furnace frame is installed. The method for constructing a coke oven according to claim 2. 2. When installing the furnace frame, the crane is adjusted so that the furnace frame vertically descends from above the back stay, and the crane is inserted between the back stay and the furnace clasp and the protective plate. The method for constructing a coke oven according to claim 3.

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